g7 tolerance (shaft, IT7)
Shaft tolerance class g7 per ISO 286-1:2010: fundamental deviation es −2 … −20, grade IT7 (10 µm at ≤ 3 mm to 63 µm at 400–500 mm). For an exact size, open the calculator with g7 selected.
- Type
- Shaft
- Grade
- IT7
- Tolerance
- 10 … 63 µm
- Fund. deviation
- es −2 … −20 µm
g7 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | −2 | −12 | 2.998 | 2.988 | −0.002 | −0.012 | −0.00008 / −0.00047 |
| 3 – 6 | −4 | −16 | 5.996 | 5.984 | −0.004 | −0.016 | −0.00016 / −0.00063 |
| 6 – 10 | −5 | −20 | 9.995 | 9.980 | −0.005 | −0.020 | −0.00020 / −0.00079 |
| 10 – 14 | −6 | −24 | 13.994 | 13.976 | −0.006 | −0.024 | −0.00024 / −0.00094 |
| 14 – 18 | −6 | −24 | 17.994 | 17.976 | −0.006 | −0.024 | −0.00024 / −0.00094 |
| 18 – 24 | −7 | −28 | 23.993 | 23.972 | −0.007 | −0.028 | −0.00028 / −0.00110 |
| 24 – 30 | −7 | −28 | 29.993 | 29.972 | −0.007 | −0.028 | −0.00028 / −0.00110 |
| 30 – 40 | −9 | −34 | 39.991 | 39.966 | −0.009 | −0.034 | −0.00035 / −0.00134 |
| 40 – 50 | −9 | −34 | 49.991 | 49.966 | −0.009 | −0.034 | −0.00035 / −0.00134 |
| 50 – 65 | −10 | −40 | 64.990 | 64.960 | −0.010 | −0.040 | −0.00039 / −0.00157 |
| 65 – 80 | −10 | −40 | 79.990 | 79.960 | −0.010 | −0.040 | −0.00039 / −0.00157 |
| 80 – 100 | −12 | −47 | 99.988 | 99.953 | −0.012 | −0.047 | −0.00047 / −0.00185 |
| 100 – 120 | −12 | −47 | 119.988 | 119.953 | −0.012 | −0.047 | −0.00047 / −0.00185 |
| 120 – 140 | −14 | −54 | 139.986 | 139.946 | −0.014 | −0.054 | −0.00055 / −0.00213 |
| 140 – 160 | −14 | −54 | 159.986 | 159.946 | −0.014 | −0.054 | −0.00055 / −0.00213 |
| 160 – 180 | −14 | −54 | 179.986 | 179.946 | −0.014 | −0.054 | −0.00055 / −0.00213 |
| 180 – 200 | −15 | −61 | 199.985 | 199.939 | −0.015 | −0.061 | −0.00059 / −0.00240 |
| 200 – 225 | −15 | −61 | 224.985 | 224.939 | −0.015 | −0.061 | −0.00059 / −0.00240 |
| 225 – 250 | −15 | −61 | 249.985 | 249.939 | −0.015 | −0.061 | −0.00059 / −0.00240 |
| 250 – 280 | −17 | −69 | 279.983 | 279.931 | −0.017 | −0.069 | −0.00067 / −0.00272 |
| 280 – 315 | −17 | −69 | 314.983 | 314.931 | −0.017 | −0.069 | −0.00067 / −0.00272 |
| 315 – 355 | −18 | −75 | 354.982 | 354.925 | −0.018 | −0.075 | −0.00071 / −0.00295 |
| 355 – 400 | −18 | −75 | 399.982 | 399.925 | −0.018 | −0.075 | −0.00071 / −0.00295 |
| 400 – 450 | −20 | −83 | 449.980 | 449.917 | −0.020 | −0.083 | −0.00079 / −0.00327 |
| 450 – 500 | −20 | −83 | 499.980 | 499.917 | −0.020 | −0.083 | −0.00079 / −0.00327 |
Deviations at the upper end of each range (Ø columns use that size); use the calculator for the exact size. — : not defined by ISO 286 for that size. Upper/Lower (mm) and inch columns are shown on wider screens.
About g7
g7 denotes a shaft tolerance zone with sliding deviation in the ISO 286 system. It is used in H8/g7 (Coarser than H7/g6 for guide pins, sliding sleeves and levers needing smooth, near-zero-play motion but made on general-purpose (not precision) machine tools.).
At Ø25 mm g7 is −0.007 / −0.028 mm, i.e. 24.972 to 24.993 mm.
How the limits are calculated
g7 uses grade IT7 (a standard tolerance of 21 µm at 18–30 mm). Fundamental deviation: es is tabulated directly by ISO 286-1 Table 2; ei = es − IT7. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.